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An empirical assessment of a univariate time series for demand planning in a demand-driven supply chain

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  • John S. Jatta
  • Krishna Kumar Krishnan

Abstract

Many firms use customer orders time series as the basis of their forecasting and demand planning. However, there are other firms that use sales orders (shipments). Our research focused on evaluating and understanding the implications of using sales orders (shipments) to plan for a supply chain. We evaluated the structural difference between customer orders time series and sales orders time series. An experiment was conducted using a set of 48-month and a set of 576-month (long) normally distributed, randomly generated customer orders time series and shipment time series. The time series were statistically evaluated periodically by rolling the data and then comparing them using a two-sample comparison in Statgraphics Centurion XVII software. The series were then used to generate periodic forecast and their forecasts statistically tested using two-sample comparison. We found a statistically significant difference between the two series for both the 48-period time series and the extended 576-period time series. Our results show that customer orders time series is statistically different from shipment timer series due to censorship. Forecasts generated from customer orders and sales orders time series exhibit statistically significant difference. Using shipment time series to forecast and plan for a demand-driven supply chain causes a perpetual state of under-inventory.

Suggested Citation

  • John S. Jatta & Krishna Kumar Krishnan, 2016. "An empirical assessment of a univariate time series for demand planning in a demand-driven supply chain," International Journal of Business Forecasting and Marketing Intelligence, Inderscience Enterprises Ltd, vol. 2(3), pages 269-290.
  • Handle: RePEc:ids:ijbfmi:v:2:y:2016:i:3:p:269-290
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    References listed on IDEAS

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